Bought a PW50 and CRF50 when my daughter just turned 6 and son just turned 3.
They both love to ride. (8 months after buying them). My son currently isn’t riding because he ran over his foot/leg and it scared him to death. He still loves his dirtbike, just won’t ride it lol.
My daughter is really doing good. She close to being ready for her first race (not mx).
Gear: good luck finding gear that actually fits the 3 year old. If you manage to get a pair of gloves on him, go immediately to buy a lottery ticket because your doing something right.
Hard to find small boots for the 3 year old, and if you do they probably won’t want to actually wear them, just talk about how awesome they are and they are like daddy. They will wear a slightly bigger helmet easier than they will wear a slightly smaller helmet.
Until they get the basics down the more saftey gear they have on the harder it will be for them.
Both of mine started out in helmet, long pants, and regular shoes. Not the safest thing but the speeds where very low and it was the only way they’d try.
Balanace bikes are a huge training aid.
Skip the training wheels if you can for the 6 year old. 3 is basically no choice, gotta use them. You can also tie a piece of rope to the PW and walk behind them. We did this the first time they rode to to make sure ole whiskey throttle didn’t sneak up.
I really focused on braking with them. I was worri d to death they’d get scared at something and grab a handful of throttle.
Minimize risk! Not just because you don’t want them to get hurt (duh), but in the early stages any little small thing that scares them could push your future pro rider to not want to ride.